
<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script>
			var x=3;
			var y=4;
			
			var z=x;
			x=y;
			y=z;
			
			alert(x);
			alert(y);
		</script>
	</body>
</html>
